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Armored Warfare: Tanks and Mountains

There
are many environments that are far from ideal for tank operations. The
cold plains of Russia will make engines freeze, while the hot deserts of
Africa will clog external parts with dust, making even the
best-cared-for vehicles break down. Few environments are as hostile to
tanks as tall mountains ranges and it is in this environment where light
tanks thrive.

Tanque 39 in Prague

The use of light tanks in mountainous areas goes back to the Second
World War and any number of examples can be brought up. Those cases were
usually based on the need to deploy armor in inaccessible areas of
countries, based on tactical and strategic demands appearing during
conflict (such as the eradication of partisans, for example), not on the
intent to actually acquire vehicles to operate in such environments in
the first place. There some exceptions, however, where countries
specifically acquired armor with the intent to operate it in the
mountains. One such example would be the Peruvian military and its Tanque 39 light tanks.A part of Peruvian territory is covered by one of the tallest
mountain ranges on Earth, the Andes. With their peaks reaching up to
7000 meters, Peru's terrain is extremely diverse and covers several
types of climates. For Peruvian armor to be able to operate under such
conditions, several conditions had to be met:

The tanks had to be rather small – the mountain roads are quite narrow and a large vehicle would not be able to operate there

The tanks had to be quite light to achieve the off-road capabilities required

The engines had to be specifically tuned to work at higher altitudes
by improving their air intake and their cooling mechanisms. The lower
boiling point of water in the mountains would reduce the effectiveness
of engine water cooling, the vehicle would also gasp for air high above
sea level where the air is not as dense

Other conditions were more region-specific. Since the 19th century
and the time of Simon Bolívar, Peru had been involved in a territory
dispute with Ecuador over several provinces that eventually escalated
into multiple armed conflicts. Most of those clashes are notable for the
use of air-force, but one – the Peru-Ecuador war of 1941 (otherwise
known as Guerra del 41) – involved light tanks that tipped the scales in
Peru's favor. These tanks were called Tanque 39 in Peruvian service,
but their factory designation was LTP and they were imported from
faraway Czechoslovakia.

Tanque 39

The designation LTP means Lehký Tank, Peruánský
(Light Tank, Peruvian) and it was built by ČKD/Praga as a response to
the needs of the Peruvian army. It was based on another light tank
called TNH. The TNH was a rather successful design built for Iran
between 1935 and 1937. Its success attracted other potential buyers.
Peru being one of them.

TNH Light Tank for Iran

The negotiations for the deal took place between 1936 and 1938 and
were led by Col. José Tamayo from Peru. The Peruvian army's most
important demand was that the vehicles should be able to operate
independently and without problems at high altitudes – the low air
pressure at high altitudes could pose a serious problem.To compensate for this, Praga engineers increased the air intake to
the engine while using better compression ratios. The result was good -
the vehicle could operate at any altitude up to 4500m above sea level
without any reduction in performance. The vehicle would also have to be
light, with reasonable firepower and adequate protection for its time.Naturally, there was the question of who the vehicle would have to
fight. Peru did not need a battle tank designed to take on hordes of
incoming Panzers, rather than a nimble quick vehicle with enough
firepower to knock out enemy infantry strongpoints and to serve in
counter-insurgency operations against infantry.Ecuador did not have any armor whatsoever at that point (they
acquired the first Marmon-Herrington tankettes in 1942, a full year
after the war), so the basic protection levels, able to withstand light
anti-tank and heavy machinegun fire, were sufficient.The LTP Light Tank weighed 7.3 tons and had 25mm thick frontal armor.
It was powered by a 125hp Scania Vabis engine, had a maximum speed of
40 km/h, an operational range of 190 kilometers and was armed with a
37mm gun.

LTP Prototype

After roughly two years of negotiations, an agreement was reached to
purchase 25 vehicles, should the prototype trials in Peru prove a
success. The prototype officially transferred to Peru in Lima under the
supervision of Captain Hector Cornejo (technical supervisor) and his two
assistants (one of whom was a Native American).The prototype vehicle was trialed in the following months and worked
perfectly, obtaining quite a reputation amongst the Peruvian soldiers.
ČKD archives speak of an incident, during trials in the mountains at
3700 meters above sea level in September 1938, where one vehicle driving
on a mountain road slipped from the slope and fell 5 meters on its
roof.The tank, however, was extremely resilient, so the damage was minor
and the vehicle was repaired by the ČKD technicians present overnight.
The trials resumed the next day. This incident actually created a whole
legend about the vehicle. The story was told so many times by so many
people that, in time, people started to believe that the tank was tipped
back on the tracks after the fall and continued running without any
repairs.While that was not what actually happened, these rumors contributed
to the excellent reputation of Czechoslovak tanks in South America.

LTP during trials in Peru

By the time the trials ended, pre-war mobilization was taking place
in Czechoslovakia and the vehicles being manufactured for Peru were
confiscated by the Czechoslovak army. After the mobilization had been
cancelled, they were returned and, in November 1938, the first 6 serial
vehicles were shipped to Peru. Twenty-four were built in total and the
last of them arrived in Peru on February 27 1939.It's worth noting that apart from the tanks, Peru ordered a large
amount of spare parts, ammunition (and weapon components) provided by
Škoda, Praga T-6 artillery tractors, a mobile repair workshop mounted on
a truck trailer, one Praga AV staff car and one Praga RV support
vehicle.The tanks saw action for the first time in 1939 against a group
attempting a coup d’état. Their debut was a success and in June they
were officially presented to the public during a military parade in
Lima.

Guerra del 41

During the Peru-Ecuador border war in July 1941, 12 of the vehicles
were successfully used against the Ecuadorean forces. The war itself
took place from July 5 to 31 1941. The Peruvian military initially had
roughly 11 thousand to 13 thousand trained men at its disposal (some
sources claim as many as 20 thousand), while the Ecuadorean army had
only approximately 1400 men and no heavy weapons at the start of the
conflict in the area. Of the 1400 men:

800 were trained soldiers of the El Oro border unit as well as nearby military units

There are two different accounts of how the war started. According to
Peruvian sources, the Ecuadorean units crossed the river Zarumilla
(serving as a natural borderline) and attacked a Peruvian border patrol
in Aguas Verdes. The Peruvian forces repelled the invaders and the
fighting gradually escalated all along the river with the Peruvian Air
Force becoming involved.The commander of the Ecuadorean forces, Colonel Louis A. Rodriguez,
said Ecuadorean soldiers discovered a Peruvian patrol and some civilians
clearing the Ecuadorean shore of the river from vegetation. The
Peruvians then opened fire, killing one Ecuadorean soldier and starting
an escalating fire fight with the Ecuadoreans.Regardless of which version is correct, the better-armed and more
numerous Peruvian units quickly pushed the Ecuadoreans from the river,
while the Peruvian Air Force started bombing several cities and towns in
Ecuador.

Tanque 39 during the Ecuador-Peru war of 1941

The light tanks helped the Peruvian forces immensely as nothing the
Ecuadoreans had could actually damage them, let alone knock them out.
The tanks could also pass through rather difficult terrain. Once the war
reached areas with better infrastructure, the fight gradually became
less one-sided, but the war still ended in a Peruvian victory. As a
result, the Peruvians got to occupy the entire El Oro province and some
towns in the Loja province. The Ecuadoreans were forced to ask for a
ceasefire. The defeat caused deep economic problems for Ecuador and laid
the foundations for several future conflicts – it would take decades
and two more wars for the border dispute to become finally resolved in
1998.As for the tanks, they did perform admirably during the war. The
Peruvians were happy with them and wanted more – but that was already
after the Second World War. More vehicles were ordered from ČKD in 1946,
but that order was never fulfilled. Only a certain amount of spare
parts was sold to the Peruvian army in 1950.

Tanque 39 during a 2014 military parade in Peru

The tanks continued to serve for three decades. In the 1970s, they
were used to fight the Maoist rebels from the Shining Path movement and
the last two remaining operational vehicles were used until 1988 for
patrol duties near Callao. By that time they were completely worn out
and they were taken out of service to be used as military monuments. One
of the tanks was sold back to the Czech Republic in 2012 and underwent
full restoration.

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